GROWTH DIFFERENTIATION FACTOR-8

Abstract: Growth differentiation factor-8 (GDF-8) is disclosed along with its polynucleotide sequence and amino acid sequence. Also disclosed are diagnostic and therapeutic methods of using the GDF-8 polypeptide and polynucleotide sequences.

Description: GROWTH DIFFERENTIATION FACTOR-8 This application is a continuation-in-part application of the U.S. Application Serial No. 08/033,923 filed on 3/19/93. BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates generally to growth factors and specifically to a new member of the transforming growth factor beta (TGF- ) superfamily, which is denoted, growth differentiation factor-8 (GDF-8). 2. Description of Related Art The transforming growth factor β (TGF-^s) superfamily encompasses a group of structurally-related proteins which affect a wide range of differentiation processes during embryonic development. The family includes, Mullerian inhibiting substance (MIS), which is required for normal male sex development (Behringer, et al., Nature, 345:167, 1990), Drosophila decapentaplegic (DPP) gene product, which is required for dorsal-ventral axis formation and morphogenesis of the imaginal disks (Padgett, et al., Nature, 325:81-84, 1987), the Xenopus Vg-1 gene product, which localizes to the vegetal pole of eggs ((Weeks, et al., Cell, 51:861-867, 1987), the activins (Mason, et al., Biochem, Biophys. Res. Commuπ., 135:957-964. 1986), which can induce the formation of mesoderm and anterior structures in Xenopus embryos (Thomsen, et al., Cell, 63:485, 1990), and the bone morphogenetic proteins (BMPs, osteogenin, OP-1) which can induce de novo cartilage and bone formation (Sampath, et al., J. Biol. Chem., 265:13198, 1990). The TGF-øs can influence a variety of differentiation processes, including adipogenesis, myogenesis, chondrogenesis, hematopoiesis, and epithelial cell differentiation (for review, see Massague, Cell 49:437, ""987). The proteins of the TGF-/3 family are initially synthesized as a large precursor protein which subsequently undergoes proteolytic cleavage at a cluster of basic residues approximately 110-140 amino acids from the C-terminus. The C- terminal regions, or mature regions, of the proteins are all structurally related and the different family members can be classified into distinct subgroups based on the extent of their homology. Although the homologies within particular subgroups range from 70% to 90% amino acid sequence identity, the homologies between subgroups are significantly lower, generally ranging from only 20% to 50%. In each case, the active species appears to be a disulfide- linked dimer of C-terminal fragments. Studies have shown that when the pro- region of a member of the TGF-/3 family is coexpressed with a mature region of another member of the TGF- family, intracellular dimerization and secretion of biologically active homodimers occur (Gray, A., and Maston, A., Science, 247:1328, 1990). Additional studies by Hammonds, et al., (Molec. Endocrin. 5:149, 1991) showed that the use of the BMP-2 pro-region combined with the BMP-4 mature region led to dramatically improved expression of mature BMP- 4. For most of the family members that have been studied, the.homodimeric species has been found to be biologically active, but for other family members, like the inhibins (Ling, et al., Nature, 321:779, 1986) and the TGF-^s (Cheifetz, et al., Cell, 48:409, 1987), heterodimers have also been detected, and these appear to have different biological properties than the respective homodimers. Identification of new factors that are tissue-specific in their expression pattern will provide a greater understanding of that tissue's development and function. SUMMARY OF THE INVENTION The present invention provides a cell growth and differentiation factor, GDF-8, a polynucleotide sequence which encodes the factor, and antibodies which are immunoreactive with the factor. This factor appears to relate to various cell proliferative disorders, especially those involving those involving muscle, nerve, and adipose tissue. Thus, in one embodiment, the invention provides a method for detecting a cell proliferative disorder of muscle, nerve, or fat origin and which is associated with GDF-8. In another embodiment, the invention provides a method for treating a cell proliferative disorder by suppressing or enhancing GDF-8 activity. BRIEF DESCRIPTION OF THE DRAWINGS FIGURE 1 is a Northern blot showing expression of GDF-8 mRNA in adult tissues. The probe was a partial murine GDF-8 clone. FIGURE 2 shows nucleotide and predicted amino acid sequences of murine GDF-8 (FIGURE 2a) and human GDF-8 (FIGURE 2b). The putative dibasic processing sites in the murine sequence are boxed. FIGURE 3 shows the alignment of the C-terminal sequences of GDF-8 with other members of the TGF-3 superfamily. The conserved cysteine residues are boxed. Dashes denote gaps introduced in order to maximize alignment. FIGURE 4 shows amino acid homologies among different members of the TGF- β superfamily. Numbers represent percent amino acid identities between each pair calculated from the first conserved cysteine to the C-terminus. Boxes represent homologies among highly-related members within particular subgroups. FIGURE 5 shows the sequence of GDF-8. Nucleotide and amino acid sequences of murine (FIGURE 5a) and human (FIGURE 5b) GDF-8 cDNA clones are shown. Numbers indicate nucleotide position relative to the 5' end. Consensus N-linked glycosylation signals are shaded. The putative RXXR proteolytic cleavage sites are boxed. FIGURE 6 shows a hydropathicity profile of GDF-8. Average hydrophobicity values for murine (FIGURE 6a) and human (FIGURE 6b) GDF-8 were calculated using the method of Kyte and Doolittle (J. Mol. Biol., 157:105-132, 1982). Positive numbers indicate increasing hydrophobicity. FIGURE 7 shows a comparison of murine and human GDF-8 amino acid sequences. The predicted murine sequence is shown in the top lines and the predicted human sequence is shown in the bottom lines. Numbers indicate amino acid position relative to the N-terminus. Identities between the two sequences are denoted by a vertical line. FIGURE 8 shows the expression of GDF-8 in bacteria. BL21 (DE3) (pLysS) cells carrying a pRSET/GDF-8 expression plasmid were induced with isopropylthio-^-galactoside, and the GDF-8 fusion protein was purified by metal chelate chromatography. Lanes: total=total cell lysate; soluble=soluble protein fraction; insoluble=insoluble protein fraction (resuspended in 10 mM Tris pH 8.0, 50 mM sodium phosphate, 8 M urea, and 10 mM ^-mercaptoethanol [buffer B]) loaded onto the column; pellet= insoluble protein fraction discarded before loading the column; flowthrough= proteins not bound by the column; washes=washes carried out in buffer B at the indicated pH's. Positions of molecular weight standards are shown at the right. Arrow indicates the position of the GDF-8 fusion protein. FIGURE 9 shows the expression of GDF-8 in mammalian cells. Chinese hamster ovary cells were transfected with pMSXND/GDF-8 expression plasmids and selected in G418. Conditioned media from G418-resistant cells (prepared from cells transfected with constructs in which GDF-8 was cloned in either the antisense or sense orientation) were concentrated, electrophoresed under reducing conditions, blotted, and probed with anti-GDF-8 antibodies and 125 [ IJiodoproteinA. Arrow indicates the position of the processed GDF-8 protein. FIGURE 10 shows the expression of GDF-8 mRNA. Poly A-selected RNA (5 μg each) prepared from adult tissues (FIGURE 10a) or placentas and embryos (FIGURE 10b) at the indicated days of gestation was electrophoresed on formaldehyde gels, blotted, and probed with full length murine GDF-8. FIGURE 11 shows chromosomal mapping of human GDF-8. DNA samples prepared from human/rodent somatic cell hybrid lines were subjected to PCR, electrophoresed on agarose gels, blotted, and probed. The human chromosome contained in each of the hybrid cell lines is identified at the top of each of the first 24 lanes (1-22, X, and Y). In the lanes designated M, CHO, and H, the starting DNA template was total genomic DNA from mouse, hamster, and human sources, respectively. In the lane marked B1 , no template DNA was used. Numbers at left indicate the mobilities of DNA standards. DETAILED DESCRIPTION OF THE INVENTION The present invention provides a growth and differentiation factor, GDF-8 and a polynucleotide sequence encoding GDF-8. GDF-8 is expressed at highest levels in muscle and at lower levels in adipose tissue. In one embodiment, the invention provides a method for detection of a cell proliferative disorder of muscle, nerve, or fat origin which is associated with GDF-8 expression. In another embodiment, the invention provides a method for treating a cell proliferative disorder by using an agent which suppresses or enhances GDF-8 activity. The TGF-β superfamily consists of multifunctional polypeptides that control proliferation, differentiation, and other functions in many cell types. Many of the peptides have regulatory, both positive and negative, effects on other peptide growth factors. The structural homology between the GDF-8 protein of this invention and the members of the TGF- family, indicates that GDF-8 is a new member of the family of growth and differentiation factors. Based on the known activities of many of the other members, it can be expected that GDF-8 will also possess biological activities that will make it useful as a diagnostic and therapeutic reagent. In particular, certain members of this superfamily have expression patterns or possess activities that relate to the function of the nervous system. For example, the inhibins and activins have been shown to be expressed in the brain (Meunier, et al., Proc. Natl. Acad. Sci., USA, 85:247, 1988; Sawchenko, et al., Nature, 334:615, 1988), and activin has been shown to be capable of functioning as a nerve cell survival molecule (Schubert, et al., Nature, 344:868. 1990). Another family member, namely, GDF-1 , is nervous system-specific in its expression pattern (Lee, S.J., Proc. Natl. Acad. Sci., USA, 88:4250, 1991), and certain other family members, such as Vgr-1 (Lyons, et al., Proc. Natl Acad. Sci., USA, 86:4554, 1989; Jones, et al., Development, 111:531 , 1991), OP-1 (Ozkaynak, et al., J. Biol. Chem., 267:25220, 1992), and BMP-4 (Jones, et al., Development, 111:531 , 1991), are also known to be expressed in the nervous system. Because it is known that skeletal muscle produces a factor or factors that promote the survival of motor neurons (Brown, Trends Neurosci., 7:10, 1984), the expression of GDF-8 in muscle suggests that one activity of GDF-8 may be as a trophic factor for neurons. In this regard, GDF-8 may have applications in the treatment of neurodegenerative diseases, such as amyotrophic lateral sclerosis, or in maintaining cells or tissues in culture prior to transplantation. GDF-8 may also have applications in treating disease processes involving muscle, such as in musculodegenerative diseases or in tissue repair due to trauma. In this regard, many other members of the TGF-β family are also important mediators of tissue repair. TGF-^s has been shown to have marked effects on the formation of collagen and to cause a striking angiogenic response in the newborn mouse (Roberts, et al., Proc. Natl. Acad. Sci., USA 83:4167, 1986). TGF- / 9 has also been shown to inhibit the differentiation of myoblasts in culture (Massague, et al., Proc. Natl. Acad. Sci., USA 83:8206, 1986). Moreover, because myoblast cells may be used as a vehicle for delivering genes to muscle for gene therapy, the properties of GDF-8 could be exploited for maintaining cells prior to transplantation or for enhancing the efficiency of the fusion process. The expression of GDF-8 in adipose tissue also raises the possibility of applications for GDF-8 in the treatment of obesity or of disorders related to abnormal proliferation of adipocytes. In this regard, TGF-9 has been shown to be a potent inhibitor of adipocyte differentiation in vitro (Ignotz and Massague, Proc. Natl. Acad. Sci., USA 82:8530, 1985). The term "substantially pure" as used herein refers to GDF-8 which is • substantially free of other proteins, lipids, carbohydrates or other materials with which it is naturally associated. One skilled in the art can purify GDF-8 using standard techniques for protein purification. The substantially pure polypeptide will yield a single major band on a non-reducing polyacrylamide gel. The purity of the GDF-8 polypeptide can also be determined by amino-terminal amino acid sequence analysis. GDF-8 polypeptide includes functional fragments of the polypeptide, as long as the activity of GDF-8 remains. Smaller peptides containing the biological activity of GDF-8 are included in the invention. The invention provides polynucleotides encoding the GDF-8 protein. These polynucleotides include DNA, cDNA and RNA sequences which encode GDF-8. It is understood that all polynucleotides encoding all or a portion of GDF-8 are also included herein, as long as they encode a polypeptide with GDF-8 activity. Such polynucleotides include naturally occurring, synthetic, and intentionally manipulated polynucleotides. For example, GDF-8 polynucleotide may be subjected to site-directed mutagenesis. The polynucleotide sequence for GDF- 8 also includes antisense sequences. The polynucleotides of the invention include sequences that are degenerate as a result of the genetic code. There are 20 natural amino acids, most of which are specified by more than one codon. Therefore, all degenerate nucleotide sequences are included in the invention as long as the amino acid sequence of GDF-8 polypeptide encoded by the nucleotide sequence is functionally unchanged. Specifically disclosed herein is a genomic DNA sequence containing a portion of the GDF-8 gene. The sequence contains an open reading frame corresponding to the predicted C-terminal region of the GDF-8 precursor protein. The encoded polypeptide is predicted to contain two potential proteolytic processing sites (KR and RR). Cleavage of the precursor at the downstream site would generate a mature biologically active C-terminal fragment of 109 amino acids with a predicted molecular weight of approximately 12,400. Also, disclosed are full length murine and human GDF-8 cDNA sequences. The murine pre-pro-GDP-8 protein is 376 amino acids in length, which is encoded by a 2676 base pair nucleotide sequence, beginning at nucleotide 104 and extending to a TGA stop codon at nucleotide 1232. The human GDF-8 protein is 375 amino acids and is encoded by a 2743 base pair sequence, with the open reading frame beginning at nucleotide 59 and extending to nucleotide 1184. The C-terminal region of GDF-8 following the putative proteolytic processing site shows significant homology to the known members of the TGF-/3 superfamily. The GDF-8 sequence contains most of the residues that are highly conserved in other family members (see FIGURE 3). Like the TGF- / 9S and inhibin βs, GDF-8 contains an extra pair of cysteine residues in addition to the 7 cysteines found in virtually all other family members. Among the known family members, GDF-8 is most homologous to Vgr-1 (45% sequence identity) (see FIGURE 4). Minor modifications of the recombinant GDF-8 primary amino acid sequence may result in proteins which have substantially equivalent activity, as compared to the GDF-8 polypeptide described herein. Such modifications may be deliberate, as by site-directed mutagenesis, or may be spontaneous. All of the polypeptides produced by these modifications are included herein as long as the biological activity of GDF-8 still exists. Further, deletion of one or more amino acids can also result in a modification of the structure of the resultant molecule without significantly altering its biological activity. This can lead to the development of a smaller active molecule which would have broader utility. For example, one can remove amino or carboxy terminal amino acids which are not required for GDF-8 biological activity. The nucleotide sequence encoding the GDF-8 polypeptide of the invention includes the disclosed sequence and conservative variations thereof. The term "conservative variation" as used herein denotes the replacement of an amino acid residue by another, biologically similar residue. Examples of conservative variations include the substitution of one hydrophobic residue such as isoleucine, valine, leucine or methionine for another, or the substitution of one polar residue for another, such as the substitution of arginine for lysine, glutamic for aspartic acid, or glutamine for asparagine, and the like. The term "conservative variation" also includes the use of a substituted amino acid in place of an unsubstituted parent amino acid provided that antibodies raised to the substituted polypeptide also immunoreact with the unsubstituted polypep¬ tide. DNA sequences of the invention can be obtained by several methods. For example, the DNA can be isolated using hybridization techniques which are well known in the art. These include, but are not limited to: 1) hybridization of genomic or cDNA libraries with probes to detect homologous nucleotide sequences, 2) polymerase chain reaction (PCR) on genomic DNA or cDNA using primers capable of annealing to the DNA sequence of interest, and 3) antibody screening of expression libraries to detect cloned DNA fragments with shared structural features. Preferably the GDF-8 polynucleotide of the invention is derived from a mammalian organism, and most preferably from a mouse, rat, or human. Screening procedures which rely on nucleic acid hybridization make it possible to isolate any gene sequence from any organism, provided the appropriate probe is available. Oligonucleotide probes, which correspond to a part of the sequence encoding the protein in question, can be synthesized chemically. This requires that short, oligopeptide stretches of amino acid sequence must be known. The DNA sequence encoding the protein can be deduced from the genetic code, however, the degeneracy of the code must be taken into account. It is possible to perform a mixed addition reaction when the sequence is degenerate. This includes a heterogeneous mixture of denatured double-stranded DNA. For such screening, hybridization is preferably performed on either single-stranded DNA or denatured double-stranded DNA. Hybridization is particularly useful in the detection of cDNA clones derived from sources where an extremely low amount of mRNA sequences relating to the polypeptide of interest are present. In other words, by using stringent hybridization conditions directed to avoid non-specific binding, it is possible, for example, to allow the autoradiographic visualization of a specific cDNA clone by the hybridization of the target DNA to that single probe in the mixture which is its complete complement (Wallace, et al., Nucl. Acid Res., 9:879, 1981). The development of specific DNA sequences encoding GDF-8 can also be obtained by: 1 ) isolation of double-stranded DNA sequences from the genomic DNA; 2) chemical manufacture of a DNA sequence to provide the necessary codons for the polypeptide of interest; and 3) in vitro synthesis of a double- stranded DNA sequence by reverse transcription of mRNA isolated from a eukaryotic donor cell. In the latter case, a double-stranded DNA complement of mRNA is eventually formed which is generally referred to as cDNA. Of the three above-noted methods for developing specific DNA sequences for use in recombinant procedures, the isolation of genomic DNA isolates is the least common. This is especially true when it is desirable to obtain the microbial expression of mammalian polypeptides due to the presence of introns. The synthesis of DNA sequences is frequently the method of choice when the entire sequence of amino acid residues of the desired polypeptide product is known. When the entire sequence of amino acid residues of the desired polypeptide is not known, the direct synthesis of DNA sequences is not possible and the method of choice is the synthesis of cDNA sequences. Among the standard procedures for isolating cDNA sequences of interest is the formation of plasmid- or phage-carrying cDNA libraries which are derived from reverse transcription of mRNA which is abundant in donor cells that have a high level of genetic expression. When used in combination with polymerase chain reaction technology, even rare expression products can be cloned. In those cases where significant portions of the amino acid sequence of the polypeptide are known, the production of labeled single or double-stranded DNA or RNA probe sequences duplicating a sequence putatively present in the target cDNA may be employed in DNA/DNA hybridization procedures which are carried out on cloned copies of the cDNA which have been denatured into a single-stranded form (Jay, et al., Nucl. Acid Res., H:2325, 1983). A cDNA expression library, such as lambda gt11 , can be screened indirectly for GDF-8 peptides having at least one epitope, using antibodies specific for GDF-8. Such antibodies can be either polyclonally or monoclonally derived and used to detect expression product indicative of the presence of GDF-8 cDNA. DNA sequences encoding GDF-8 can be expressed in vitro by DNA transfer into a suitable host cell. "Host cells" are cells in which a vector can be propagated and its DNA expressed. The term also includes any progeny of the subject host cell. It is understood that all progeny may not be identical to the parental cell since there may be mutations that occur during replication. However, such progeny are included when the term "host cell" is used. Methods of stable transfer, meaning that the foreign DNA is continuously maintained in the host, are known in the art. In the present invention, the GDF-8 polynucleotide sequences may be inserted into a recombinant expression vector. The term "recombinant expression vector" refers to a plasmid, virus or other vehicle known in the art that has been manipulated by insertion or incorporation of the GDF-8 genetic sequences. Such expression vectors contain a promoter sequence which facilitates the efficient transcription of the inserted genetic sequence of the host. The expression vector typically contains an origin of replication, a promoter, as well as specific genes which allow phenotypic selection of the transformed cells. Vectors suitable for use in the present invention include, but are not limited to the T7-based expression vector for expression in bacteria (Rosenberg, et al., Gene, 56:125, 1987), the pMSXND expression vector for expression in mammalian cells (Lee and Nathans, J. Biol. Chem., 263:3521 , 1988) and baculovirus-derived vectors for expression in insect cells. The DNA segment can be present in the vector operably linked to regulatory elements, for example, a promoter (e.g., T7, metallothionein I, or polyhedrin promoters). Polynucleotide sequences encoding GDF-8 can be expressed in either prokaryotes or eukaryotes. Hosts can include microbial, yeast, insect and mammalian organisms. Methods of expressing DNA sequences having eukaryotic or viral sequences in prokaryotes are well known in the art. Biologically functional viral and plasmid DNA vectors capable of expression and replication in a host are known in the art. Such vectors are used to incorp¬ orate DNA sequences of the invention. Preferably, the mature C-terminal region of GDF-8 is expressed from a cDNA clone containing the entire coding sequence of GDF-8. Alternatively, the C-terminal portion of GDF-8 can be expressed as a fusion protein with the pro- region of another member of the TGF- family or co-expressed with another pro- region (see for example, Hammonds, et al., Molec. Endocrin. 5:149, 1991 ; Gray, A., and Mason, A., Science, 247:1328, 1990). Transformation of a host cell with recombinant DNA may be carried out by conventional techniques as are well known to those skilled in the art. Where the host is prokaryotic, such as E. coli, competent cells which are capable of DNA uptake can be prepared from cells harvested after exponential growth phase and subsequently treated by the CaC-2 method using procedures well known in the art. Alternatively, MgCl2 or RbCI can be used. Transformation can also be performed after forming a protoplast of the host cell if desired. When the host is a eukaryote, such methods of transfection of DNA as calcium phosphate co-precipitates, conventional mechanical procedures such as microinjection, electroporation, insertion of a plasmid encased in liposomes, or virus vectors may be used. Eukaryotic cells can also be cotransformed with DNA sequences encoding the GDF-8 of the invention, and a second foreign DNA molecule encoding a selectable phenotype, such as the herpes simplex thymidine kinase gene. Another method is to use a eukaryotic viral vector, such as simian virus 40 (SV40) or bovine papilloma virus, to transiently infect or transform eukaryotic cells and express the protein, (see for example, Eukaryotic Viral Vectors, Cold Spring Harbor Laboratory, Gluzman ed., 1982). Isolation and purification of microbial expressed polypeptide, or fragments thereof, provided by the invention, may be carried out by conventional means including preparative chromatography and immunological separations involving monoclonal or polyclonal antibodies. The invention includes antibodies immunoreactive with GDF-8 polypeptide or functional fragments thereof. Antibody which consists essentially of pooled monoclonal antibodies with different epitopic specificities, as well as distinct monoclonal antibody preparations are provided. Monoclonal antibodies are made from antigen containing fragments of the protein by methods well known to those skilled in the art (Kohler, et al., Nature, 256:495, 1975). The term antibody as used in this invention is meant to include intact molecules as well as fragments thereof, such as Fab and F(ab')2, which are capable of binding an epitopic determinant on GDF-8. The term "cell-proliferative disorder" denotes malignant as well as non-malignant cell populations which often appear to differ from the surrounding tissue both morphologically and genotypically. Malignant cells (i.e. cancer) develop as a result of a multistep process. The GDF-8 polynucleotide that is an antisense molecule is useful in treating malignancies of the various organ systems, particularly, for example, cells in muscle or adipose tissue. Essentially, any disorder which is etiologically linked to altered expression of GDF-8 could be considered susceptible to treatment with a GDF-8 suppressing reagent. One such disorder is a malignant cell proliferative disorder, for example. The invention provides a method for detecting a cell proliferative disorder of muscle or adipose tissue which comprises contacting an anti-GDF-8 antibody with a cell suspected of having a GDF-8 associated disorder and detecting binding to the antibody. The antibody reactive with GDF-8 is labeled with a compound which allows detection of binding to GDF-8. For purposes of the invention, an antibody specific for GDF-8 polypeptide may be used to detect the level of GDF-8 in biological fluids and tissues. Any specimen containing a detectable amount of antigen can be used. A preferred sample of this invention is muscle tissue. The level of GDF-8 in the suspect cell can be compared with the level in a normal cell to determine whether the subject has a GDF-8-associated cell proliferative disorder. Preferably the subject is human. The antibodies of the invention can be used in any subject in which it is desirable to administer in vitro or in vivo immunodiagnosis or immunotherapy. The antibodies of the invention are suited for use, for example, in immuno- assays in which they can be utilized in liquid phase or bound to a solid phase carrier. In addition, the antibodies in these immunoassays can be detectably labeled in various ways. Examples of types of immunoassays which can utilize antibodies of the invention are competitive and non-competitive immunoassays in either a direct or indirect format. Examples of such immunoassays are the radioimmunoassay (RIA) and the sandwich (immunometric) assay. Detection of the antigens using the antibodies of the invention can be done utilizing immunoassays which are run in either the forward, reverse, or simultaneous modes, including immunohistochemical assays on physiological samples. Those of skill in the art will know, or can readily discern, other immunoassay formats without undue experimentation. The antibodies of the invention can be bound to many different carriers and used to detect the presence of an antigen comprising the polypeptide of the invention. Examples of well-known carriers include glass, polystyrene, polypropylene, polyethylene, dextran, nylon, amylases, natural and modified celluloses, polyacrylamides, agaroses and magnetite. The nature of the carrier can be either soluble or insoluble for purposes of the invention. Those skilled in the art will know of other suitable carriers for binding antibodies, or will be able to ascertain such, using routine experimentation. There are many different labels and methods of labeling known to those of ordinary skill in the art. Examples of the types of labels which can be used in the present invention include enzymes, radioisotopes, fluorescent compounds, colloidal metals, chemiluminescent compounds, phosphorescent compounds, and bioluminescent compounds. Those of ordinary skill in the art will know of other suitable labels for binding to the antibody, or will be able to ascertain such, using routine experimentation. Another technique which may also result in greater sensitivity consists of coupling the antibodies to low molecular weight haptens. These haptens can then be specifically detected by means of a second reaction. For example, it is common to use such haptens as biotin, which reacts with avidin, or dinitrophenyl, puridoxal, and fluorescein, which can react with specific anti- hapten antibodies. In using the monoclonal antibodies of the invention for the in vivo detection of antigen, the detectably labeled antibody is given a dose which is diagnostically effective. The term "diagnostically effective" means that the amount of detectably labeled monoclonal antibody is administered in sufficient quantity to enable detection of the site having the antigen comprising a polypeptide of the invention for which the monoclonal antibodies are specific. The concentration of detectably labeled monoclonal antibody which is administered should be sufficient such that the binding to those cells having the polypeptide is detectable compared to the background. . Further, it is desirable that the detectably labeled monoclonal antibody be rapidly cleared from the circulatory system in order to give the best target-to-background signal ratio. As a rule, the dosage of detectably labeled monoclonal antibody for in vivo diagnosis will vary depending on such factors as age, sex, and extent of disease of the individual. Such dosages may vary, for example, depending on whether multiple injections are given, antigenic burden, and other factors known to those of skill in the art. For in vivo diagnostic imaging, the type of detection instrument available is a major factor in selecting a given radioisotope. The radioisotope chosen must have a type of decay which is detectable for a given type of instrument. Still another important factor in selecting a radioisotope for in vivo diagnosis is that deleterious radiation with respect to the host is minimized. Ideally, a radio¬ isotope used for in vivo imaging will lack a particle emission, but produce a large number of photons in the 140-250 keV range, which may readily be detected by conventional gamma cameras. For in vivo diagnosis radioisotopes may be bound to immunoglobulin either directly or indirectly by using an intermediate functional group. Intermediate functional groups which often are used to bind radioisotopes which exist as metallic ions to immunoglobulins are the bifunctional chelating agents such as diethylenetriaminepentacetic acid (DTPA) and ethylenediaminetetraacetic acid (EDTA) and similar molecules. Typical examples of metallic ions which can be 1 1 1 7 67 68 bound to the monoclonal antibodies of the invention are In, Ru, Ga, Ga, 72 As, 89 Zr,and 201 TI. The monoclonal antibodies of the invention can also be labeled with a paramagnetic isotope for purposes of in vivo diagnosis, as in magnetic resonance imaging (MRI) or electron spin resonance (ESR). In general, any conventional method for visualizing diagnostic imaging can be utilized. Usually gamma and positron emitting radioisotopes are used for camera imaging and paramagnetic isotopes for MRI. Elements which are particularly useful in such techniques include 157 Gd, 55 Mn, 162 Dy ) 52 Cr,and 56 Fe. The monoclonal antibodies of the invention can be used in vitro and in vivo to monitor the course of amelioration of a GDF-8-associated disease in a subject. Thus, for example, by measuring the increase or decrease in the number of cells expressing antigen comprising a polypeptide of the invention or changes in the concentration of such antigen present in various body fluids, it would be possible to determine whether a particular therapeutic regimen aimed at ameliorating the GDF-8-associated disease is effective. The term "ameliorate" denotes a lessening of the detrimental effect of the GDF-8-associated disease in the subject receiving therapy. The present invention identifies a nucleotide sequence that can be expressed in an altered manner as compared to expression in a normal cell, therefore it is possible to design appropriate therapeutic or diagnostic techniques directed to this sequence. Thus, where a cell-proliferative disorder is associated with the expression of GDF-8, nucleic acid sequences that interfere with GDF-8 expression at the translational level can be used. This approach utilizes, for example, antisense nucleic acid and ribozymes to block translation of a specific GDF-8 mRNA, either by masking that mRNA with an antisense nucleic acid or by cleaving it with a ribozyme. Such disorders include neurodegenerative diseases, for example. Antisense nucleic acids are DNA or RNA molecules that are complementary to at least a portion of a specific mRNA molecule (Weintraub, Scientific American, 262:40. 1990). In the cell, the antisense nucleic acids hybridize to the corresponding mRNA, forming a double-stranded molecule. The antisense nucleic acids interfere with the translation of the mRNA, since the cell will not translate a mRNA that is double-stranded. Antisense oligomers of about 15 nucleotides are preferred, since they are easily synthesized and are less likely to cause problems than larger molecules when introduced into the target GDF- 8-producing cell. The use of antisense methods to inhibit the in vitro translation of genes is well known in the art (Marcus-Sakura, Anal.Biochem., 1Z2:289, 1988). Ribozymes are RNA molecules possessing the ability to specifically cleave other single-stranded RNA in a manner analogous to DNA restriction endonucleases. Through the modification of nucleotide sequences which encode these RNAs, it is possible to engineer molecules that recognize specific nucleotide sequences in an RNA molecule and cleave it (Cech, J.Amer.Med. Assn., 260:3030, 1988). A major advantage of this approach is that, because they are sequence-specific, only mRNAs with particular sequences are inactivated. There are two basic types of ribozymes namely, tetrahymena-type (Hasselhoff, Nature, 334:585, 1988) and "hammerhead"-type. Tetrahymena-type ribozymes recognize sequences which are four bases in length, while "hammerhead"-type ribozymes recognize base sequences 11-18 bases in length. The longer the recognition sequence, the greater the likelihood that the sequence will occur exclusively in the target mRNA species. Consequently, hammerhead-type ribozymes are preferable to tetrahymena-type ribozymes for inactivating a specific mRNA species and 18-based recognition sequences are preferable to shorter recognition sequences. The present invention also provides gene therapy for the treatment of cell proliferative or immunologic disorders which are mediated by GDF-8 protein. Such therapy would achieve its therapeutic effect by introduction of the GDF-8 antisense polynucleotide into cells having the proliferative disorder. Delivery of antisense GDF-8 polynucleotide can be achieved using a recombinant expres¬ sion vector such as a chimeric virus or a colloidal dispersion system. Especially preferred for therapeutic delivery of antisense sequences is the use of targeted liposomes. Various viral vectors which can be utilized for gene therapy as taught herein include adenovirus, herpes virus, vaccinia, or, preferably, an RNA virus such as a retrovirus. Preferably, the retroviral vector is a derivative of a murine or avian retrovirus. Examples of retroviral vectors in which a single foreign gene can be inserted include, but are not limited to: Moloney murine leukemia virus (MoMuLV), Harvey murine sarcoma virus (HaMuSV), murine mammary tumor virus (MuMTV), and Rous Sarcoma Virus (RSV). A number of additional retroviral vectors can incorporate multiple genes. All of these vectors can transfer or incorporate a gene for a selectable marker so that transduced cells can be identified and generated. By inserting a GDF-8 sequence of interest into the viral vector, along with another gene which encodes the ligand for a receptor on a specific target cell, for example, the vector is now target specific. Retroviral vectors can be made target specific by attaching, for example, a sugar, a glycolipid, or a protein. Preferred targeting is accomplished by using an antibody to target the retroviral vector. Those of skill in the art will know of, or can readily ascertain without undue experimentation, specific polynucleotide sequences which can be inserted into the retroviral genome or attached to a viral envelope to allow target specific delivery of the retroviral vector containing the GDF-8 antisense polynucleotide. Since recombinant retroviruses are defective, they require assistance in order to produce infectious vector particles. This assistance can be provided, for example, by using helper cell lines that contain plasmids encoding all of the structural genes of the retrovirus under the control of regulatory sequences within the LTR. These plasmids are missing a nucleotide sequence which enables the packaging mechanism to recognize an RNA transcript for encapsidation. Helper cell lines which have deletions of the packaging signal include, but are not limited to Φ2, PA317 and PA12, for example. These cell lines produce empty virions, since no genome is packaged. If a retroviral vector is introduced into such cells in which the packaging signal is intact, but the structural genes are replaced by other genes of interest, the vector can be packaged and vector virion produced. Alternatively, NIH 3T3 or other tissue culture cells can be directly transfected with plasmids encoding the retroviral structural genes gag, pol and env, by conventional calcium phosphate transfection. These cells are then transfected with the vector plasmid containing the genes of interest. The resulting cells release the retroviral vector into the culture medium. Another targeted delivery system for GDF-8 antisense polynucleotides is a colloidal dispersion system. Colloidal dispersion systems include macromole- cule complexes, nanocapsules, microspheres, beads, and lipid-based systems including oil-in-water emulsions, micelles, mixed micelles, and liposomes. The preferred colloidal system of this invention is a liposome. Liposomes are artificial membrane vesicles which are useful as delivery vehicles in vitro and in vivo. It has been shown that large unilamellar vesicles (LUV), which range in size from 0.2-4.0 μm can encapsulate a substantial percentage of an aqueous buffer containing large macromolecules. RNA, DNA and intact virions can be encapsulated within the aqueous interior and be delivered to cells in a biologically active form (Fraley, et al., Trends Biochem. Sci., 6:77, 1981). In addition to mammalian cells, liposomes have been used for delivery of polynucleotides in plant, yeast and bacterial cells. In order for a liposome to be an efficient gene transfer vehicle, the following characteristics should be present: (1 ) encapsulation of the genes of interest at high efficiency while not compromising their biological activity; (2) preferential and substantial binding to a target cell in comparison to non-target cells; (3) delivery of the aqueous contents of the vesicle to the target cell cytoplasm at high efficiency; and (4) accurate and effective expression of genetic information (Mannino, et al., Biotechniques, 6:682, 1988). The composition of the liposome is usually a combination of phospholipids, particularly high-phase-transition-temperature phospholipids, usually in combination with steroids, especially cholesterol. Other phospholipids or other lipids may also be used. The physical characteristics of liposomes depend on pH, ionic strength, and the presence of divalent cations. Examples of lipids useful in liposome production include phosphatidyl compounds, such as phosphatidylglycerol, phosphatidylcholine, phosphatidylserine,phosphatidylethanolamine,sphingoiipids,cerebrosides,and gangliosides. Particularly useful are diacylphosphatidylglycerols, where the lipid moiety contains from 14-18 carbon atoms, particularly from 16-18 carbon atoms, and is saturated. Illustrative phospholipids include egg phosphatidyl¬ choline, dipalmitoylphosphatidylcholine and distearoylphosphatidylcholine. The targeting of liposomes can be classified based on anatomical and mechanistic factors. Anatomical classification is based on the level of selectivity, for example, organ-specific, cell-specific, and organelle-specific. Mechanistic targeting can be distinguished based upon whether it is passive or active. Passive targeting utilizes the natural tendency of liposomes to distribute to cells of the reticulo-endothelial system (RES) in organs which contain sinusoidal capillaries. Active targeting, on the other hand, involves alteration of the liposome by coupling the liposome to a specific ligand such as a monoclonal antibody, sugar, glycolipid, or protein, or by changing the composition or size of the liposome in order to achieve targeting to organs and cell types other than the naturally occurring sites of localization. The surface of the targeted delivery system may be modified in a variety of ways. In the case of a liposomal targeted delivery system, lipid groups can be incorporated into the lipid bilayer of the liposome in order to maintain the targeting ligand in stable association with the liposomal bilayer. Various linking groups can be used for joining the lipid chains to the targeting ligand. Due to the expression of GDF-8 in muscle and adipose tissue, there are a variety of applications using the polypeptide, polynucleotide, and antibodies of the invention, related to these tissues. Such applications include treatment of cell proliferative disorders involving these and other tissues, such as neural tissue. In addition, GDF-8 may be useful in various gene therapy procedures. The data in Example 6 shows that the human GDF-8 gene is located on chromosome 2. By comparing the chromosomal location of GDF-8 with the map positions of various human disorders, it should be possible to determine whether mutations in the GDF-8 gene are involved in the etiology of human diseases. For example, an autosomal recessive form of juvenile amyotrophic lateral sclerosis has been shown to map to chromosome 2 (Hentati, et al., Neurology, 42 [Suppl.3]:201 , 1992). More precise mapping of GDF-8 and analysis of DNA from these patients may indicate that GDF-8 is, in fact, the gene affected in this disease. In addition, GDF-8 is useful for distinguishing chromosome 2 from other chromosomes. The following examples are intended to illustrate but not limit the invention. While they are typical of those that might be used, other procedures known to those skilled in the art may alternatively be used. EXAMPLE 1 IDENTIFICATION AND ISOLATION OF A NOVEL TGF-B FAMILY MEMBER To identify a new member of the TGF-,9 superfamily, degenerate oligonucleotides were designed which corresponded to two conserved regions among the known family members: one region spanning the two tryptophan residues conserved in all family members except MIS and the other region spanning the invariant cysteine residues near the C-terminus. These primers were used for polymerase chain reactions on mouse genomic DNA followed by subcloning the PCR products using restriction sites placed at the 5' ends of the primers, picking individual E. coli colonies carrying these subcloned inserts, and using a combination of random sequencing and hybridization analysis to eliminate known members of the superfamily. GDF-8 was identified from a mixture of PCR products obtained with the primers SJL141 : 5'-CCGGAATTCGGITGG(G/C/A)A(G/A/T/C)(A/G)A(T/C)TGG(A/G)TI (A/G)TI(T/G)CICC-3' (SEQ ID NO:1) SJL147: 5'-CCGGAATTC(G/A)CAI(G/C)C(G/A)CA(G/A)CT(G/A/T/C) TCIACI(G/A)(T/C)CAT-3' (SEQ ID NO:2) PCR using these primers was carried out with 2 μg mouse genomic DNA at 94°C for 1 min, 50°C for 2 min, and 72°C for 2 min for 40 cycles. PCR products of approximately 280 bp were gel-purified, digested with Eco Rl, gel-purified again, and subcloned in the Bluescript vector (Stratagene, San Diego, CA). Bacterial colonies carrying individual subclones were picked into 96 well microtiter plates, and multiple replicas were prepared by plating the cells onto nitrocellulose. The replicate filters were hybridized to probes representing known members of the family, and DNA was prepared from non- hybridizing colonies for sequence analysis. The primer combination of SJL141 and SJL147, encoding the amino acid sequences GW(H/Q/N/K/D/E)(D/N)W(V/I/M)(V/I/M)(A S)P (SEQ ID NO:9) and M(V/I/M/T/A)V(D/E)SC(G/A)C (SEQ ID NO:10), respectively, yielded four previously identified sequences (BMP-4, inhibin βB, GDF-3 and GDF-5) and one novel sequence, which was designated GDF-8, among 110 subclones analyzed. Human GDF-8 was isolated using the primers: ACM13: 5'-CGCGGATCCAGAAGTCAAGGTGACAGACACAC-3' (SEQ ID NO:3) ; and ACM14: 5'-CGCGGATCCTCCTCATGAGCACCCACAGCGGTC-3' (SEQ ID NO:4) PCR using these primers was carried out with one μg human genomic DNA at 94°C for 1 min, 58°C for 2 min, and 72°C for 2 min for 30 cycles. The PCR product was digested with Bam HI, gel-purified, and subcloned in the Bluescript vector (Stratagene, San Francisco, CA). EXAMPLE 2 EXPRESSION PATTERN AND SEQUENCE OF GDF-8 To determine the expression pattern of GDF-8, RNA samples prepared from a variety of adult tissues were screened by Northern analysis. RNA isolation and Northern analysis were carried out as described previously (Lee, S.-J., Mol. Endocrinol., 4:1034, 1990) except that hybridization was carried out in 5X SSPE, 10% dextran sulfate, 50% formamide, 1% SDS, 200 μg/ml salmon DNA, and 0.1% each of bovine serum albumin, ficoll, and polyvinylpyrrolidone. Five micrograms of twice poly A-selected RNA prepared from each tissue (except for muscle, for which only 2 μg RNA was used) were electrophoresed on formaldehyde gels, blotted, and probed with GDF-8. As shown in FIGURE 1 , the GDF-8 probe detected a single mRNA species expressed at highest levels in muscle and at significantly lower levels in adipose tissue. To obtain a larger segment of the GDF-8 gene, a mouse genomic library was screened with a probe derived from the GDF-8 PCR product. The partial sequence of a GDF-8 genomic clone is shown in FIGURE 2a. The sequence contains an open reading frame corresponding to the predicted C-terminal region of the GDF-8 precursor protein. The predicted GDF-8 sequence contains two potential proteolytic processing sites, which are boxed. Cleavage of the precursor at the second of these sites would generate a mature C- terminal fragment 109 amino acids in length with a predicted molecular weight of 12,400. The partial sequence of human GDF-8 is shown in FIGURE 2b. Assuming no PCR-induced errors during the isolation of the human clone, the human and mouse amino acid sequences in this region are 100% identical. The C-terminal region of GDF-8 following the putative proteolytic processing site shows significant homology to the known members of the TGF-3 superfamily (FIGURE 3). FIGURE 3 shows the alignment of the C-terminal sequences of GDF-8 with the corresponding regions of human GDF-1 (Lee, Proc. Natl. Acad. Sci. USA, 88:4250-4254, 1991), human BMP-2 and 4 (Wozney, et al., Science, 242:1528-1534, 1988), human Vgr-1 (Celeste, et al., Proc. Natl. Acad. Sci. USA, 87_:9843-9847, 1990), human OP-1 (Ozkaynak, et al., EMBO J., 9:2085-2093, 1990), human BMP-5 (Celeste, et al., Proc. Natl. Acad. Sci. USA, 87_:9843-9847, 1990), human BMP-3 (Wozney, et al., Science, 242:1528-1534, 1988), human MIS (Cate, et al., Cell, 45:685-698, 1986), human inhibin alpha, β , and βB (Mason, et al., Biochem, Biophys. Res. Commun., 135:957-964, 1986), human TGF- / 31 (Derynck, et al., Nature, 316:701-705. 1985), humanTGF- 32 (deMartin, et al., EMBO J., 6:3673-3677, 1987), and human TGF-^3 (ten Dijke, et a!., Proc. Natl. Acad. Sci. USA, 85:4715-4719, 1988). The conserved cysteine residues are boxed. Dashes denote gaps introduced in order to maximize the alignment. GDF-8 contains most of the residues that are highly conserved in other family members, including the seven cysteine residues with their characteristic spacing. Like the TGF-øs and inhibin βs, GDF-8 also contains two additional cysteine residues. In the case of TGF-32, these two additional cysteine residues are known to form an intramolecular disulfide bond (Daopin, et al., Science, 257:369, 1992; Schlunegger and Grutter, Nature, 358:430, 1992). FIGURE 4 shows the amino acid homologies among the different members of the TGF-y3 superfamily. Numbers represent percent amino acid identities between each pair calculated from the first conserved cysteine to the C- terminus. Boxes represent homologies among highly-related members within particular subgroups. In this region, GDF-8 is most homologous to Vgr-1 (45% sequence identity). EXAMPLE 3 ISOLATION OF cDNA CLONES ENCODING MURINE AND HUMAN GDF-8 In order to isolate full-length cDNA clones encoding murine and human GDF-8, cDNA libraries were prepared in the lambda ZAP II vector (Stratagene) using RNA prepared from skeletal muscle. From 5 μg of twice poly A-selected RNA prepared from murine and human muscle, cDNA libraries consisting of 4.4 million and 1.9 million recombinant phage, respectively, were constructed according to the instructions provided by Stratagene. These libraries were screened without amplification. Library screening and characterization of cDNA inserts were carried out as described previously (Lee, Mol. Endocrinol, 4:1034- 1040). From 2.4 x 10 recombinant phage screened from the murine muscle cDNA library, greater than 280 positive phage were identified using a murine GDF-8 probe derived from a genomic clone, as described in Example 1. The entire nucleotide sequence of the longest cDNA insert analyzed is shown in FIGURE 5a and SEQ ID NO:11. The 2676 base pair sequence contains a single long open reading frame beginning with a methionine codon at nucleotide 104 and extending to a TGA stop codon at nucleotide 1232. Upstream of the putative initiating methionine codon is an in-frame stop codon at nucleotide 23. The predicted pre-pro-GDF-8 protein is 376 amino acids in length. The sequence contains a core of hydrophobic amino acids at the N-terminus suggestive of a signal peptide for secretion (FIGURE 6a), one potential N-glycosylation site at asparagine 72, a putative RXXR proteolytic cleavage site at amino acids 264- 267, and a C-terminal region showing significant homology to the known members of the TGF- superfamily. Cleavage of the precursor protein at the putative RXXR site would generate a mature C-terminal GDF-8 fragment 109 amino acids in length with a predicted molecular weight of approximately 12,400. From 1.9 x 10 recombinant phage screened from the human muscle cDNA library, 4 positive phage were identified using a human GDF-8 probe derived by polymerase chain reaction on human genomic DNA. The entire nucleotide sequence of the longest cDNA insert is shown in FIGURE 5b and SEQ ID NO: 13. The 2743 base pair sequence contains a single long open reading frame beginning with a methionine codon at nucleotide 59 and extending to a TGA stop codon at nucleotide 1184. The predicted pre-pro-GDF-8 protein is 375 amino acids in length. The sequence contains a core of hydrophobic amino acids at the N-terminus suggestive of a signal peptide for secretion (FIGURE 6b), one potential N-glycosylation site at asparagine 71 , and a putative RXXR proteolytic cleavage site at amino acids 263-266. FIGURE 7 shows a comparison of the predicted murine (top) and human (bottom) GDF-8 amino acid sequences. Numbers indicate amino acid position relative to the N-terminus. Identities between the two sequences are denoted by a vertical line. Murine and human GDF-8 are approximately 94% identical in the predicted pro-regions and 100% identical following the predicted RXXR cleavage sites. EXAMPLE 4 PREPARATION OF ANTIBODIES AGAINST GDF-8 AND EXPRESSION OF GDF-8 IN MAMMALIAN CELLS In order to prepare antibodies against GDF-8, GDF-8 antigen was expressed as a fusion protein in bacteria. A portion of murine GDF-8 cDNA spanning amino acids 268-376 (mature region) was inserted into the pRSET vector (Invitrogen) such that the GDF-8 coding sequence was placed in frame with the initiating methionine codon present in the vector; the resulting construct created an open reading frame encoding a fusion protein with a molecular weight of approximately 16,600. The fusion construct was transformed into BL21 (DE3) (pLysS) cells, and expression of the fusion protein was induced by treatment with isopropylthio-^-galactoside as described (Rosenberg, et al., Gene, 56:125-135). The fusion protein was then purified by metal chelate chromatography according to the instructions provided by Invitrogen. A Coomassie blue-stained gel of unpurified and purified fusion proteins is shown in FIGURE 8. The purified fusion protein was used to immunize both rabbits and chickens. Immunization of rabbits was carried out by Spring Valley Labs (Sykesville, MD), and immunization of chickens was carried out by HRP, Inc. (Denver, PA). Western analysis of sera both from immunized rabbits and from immunized chickens demonstrated the presence of antibodies directed against the fusion protein. To express GDF-8 in mammalian cells, the murine GDF-8 cDNA sequence from nucleotides 48-1303 was cloned in both orientations downstream of the metallothionein I promoter in the pMSXND expression vector; this vector contains processing signals derived from SV40, a dihydrofolate reductase gene, and a gene conferring resistance to the antibiotic G418 (Lee and Nathans, J. Biol. Chem., 263:3521-3527). The resulting constructs were transfected into Chinese hamster ovary cells, and stable tranfectants were selected in the presence of G418. Two milliliters of conditioned media prepared from the G418-resistant cells were dialyzed, lyophilized, electrophoresed under denaturing, reducing conditions, transferred to nitrocellulose, and incubated with anti-GDF-8 antibodies (described above) and [ 125 l]iodoproteirA. As shown in FIGURE 9, the rabbit GDF-8 antibodies (at a 1 :500 dilution) detected a protein of approximately the predicted molecular weight for the mature C-terminal fragment of GDF-8 in the conditioned media of cells transfected with a construct in which GDF-8 had been cloned in the correct (sense) orientation with respect to the metallothionein promoter (lane 2); this band was not detected in a similar sample prepared from cells transfected with a control antisense construct (lane 1). Similar results were obtained using antibodies prepared in chickens. Hence, GDF-8 is secreted and proteolytically processed by these transfected mammalian cells. EXAMPLE 5 EXPRESSION PATTERN OF GDF-8 To determine the pattern of GDF-8, 5 μg of twice poly A-selected RNA prepared from a variety of murine tissue sources were subjected to Northern analysis. As shown in FIGURE 10a (and as shown previously in Example 2), the GDF-8 probe detected a single mRNA species present almost exclusively in skeletal muscle among a large number of adult tissues surveyed. On longer exposures of the same blot, significantly lower but detectable levels of GDF-8 mRNA were seen in fat, brain, thymus, heart, and lung. Hence, these results confirm the high degree of specificity of GDF-8 expression in skeletal muscle. GDF-8 mRNA was also detected in mouse embryos at both gestational ages (day 12.5 and day 18.5 post-coital) examined but not in placentas at various stages of development (FIGURE 10b). EXAMPLE 6 CHROMOSOMAL LOCALIZATION OF GDF-8 In order to map the chromosomal location of GDF-8, DNA samples from human/rodent somatic cell hybrids (Drwinga, et al., Genomics, 16:311-413, 1993; Dubois and Naylor, Genomics, 16:315-319, 1993) were analyzed by polymerase chain reaction followed by Southern blotting. Polymerase chain r e a ct i o n w as c a r r i e d o u t u s i n g p r i m e r # 83 , 5 ' - CGCGGATCCGTGGATCTAAATGAGAACAGTGAGC-3' (SEQ ID NO:15) and primer #84, 5'-CGCGAATTCTCAGGTAATGATTGTTTCCGTTGTAGCG-3'(SEQ ID NO: 16) for 40 cycles at 94° C for 2 minutes, 60° C for 1 minute, and 72° C for 2 minutes. These primers correspond to nucleotides 119 to 143 (flanked by a Bam H1 recognition sequence), and nucleotides 394 to 418 (flanked by an Eco R1 recognition sequence), respectively, in the human GDF-8 cDNA sequence. PCR products were electrophoresed on agarose gels, blotted, and probed with oligonucleotide #100, 5'-ACACTAAATCTTCAAGAATA-3' (SEQ ID NO: 17), which corresponds to a sequence internal to the region flanked by primer #83 and #84. Filters were hybridized in 6 X SSC, 1 X Denhardt's solution, 100μg/ml yeast transfer RNA, and 0.05% sodium pyrophosphate at 50°C. As shown in FIGURE 11 , the human-specific probe detected a band of the predicted size (approximately 320 base pairs) in the positive control sample (total human genomic DNA) and in a single DNA sample from the human/rodent hybrid panel. This positive signal corresponds to human chromosome 2. The human chromosome contained in each of the hybrid cell lines is identified at the top of each of the first 24 lanes (1-22, X, and Y). In the lanes designated M, CHO, and H, the starting DNA template was total genomic DNA from mouse, hamster, and human sources, respectively. In the lane marked B1 , no template DNA was used. Numbers at left indicate the mobilities of DNA standards. These data show that the human GDF-8 gene is located on chromosome 2. Although the invention has been described with reference to the presently preferred embodiment, it should be understood that various modifications can be made without departing from the spirit of the invention. Accordingly, the invention is limited only by the following claims. SUMMARY OF SEQUENCES SEQ ID NO: 1 is the nucleic acid sequence for clone SJL141. SEQ ID NO: 2 is the nucleic acid sequence for clone SJL147. SEQ ID NO: 3 is the nucleic acid sequence for clone ACM13. SEQ ID NO: 4 is the nucleic acid sequence for clone ACM14. SEQ ID NO: 5 is the partial nucleotide sequence and deduced amino acid sequence for murine GDF-8. SEQ ID NO: 6 is the deduced partial amino acid sequence for murine GDF-8. SEQ ID NO: 7 is the partial nucleotide sequence and deduced amino acid sequence for human GDF-8. SEQ ID NO: 8 is the deduced partial amino acid sequence for human GDF-8. SEQ ID NO: 9 is the amino acid sequence for primer SJL141. SEQ ID NO: 10 is the amino acid sequence for primer SJL147. SEQ ID NO: 11 is the nucleotide and deduced amino acid sequence for murine GDF-8. SEQ ID NO: 12 is the deduced amino acid sequence for murine GDF-8. SEQ ID NO: 13 is the nucleotide and deduced amino acid sequence for human GDF-8. SEQ ID NO: 14 is the deduced amino acid sequence for human GDF-8. SEQ ID NO's: 15 and 16 are nucleotide sequences for primer #83 and #84, respectively, which were used to map human GDF-8 in human/rodent somatic cell hybrids. SEQ ID NO: 17 is the nucleotide sequence of oligonucleotide #100 which corresponds to a sequence internal to the region flanked by primer #83 and #84. SEQUENCE LISTING (1) GENERAL INFORMATION: (i) APPLICANT: THE JOHNS HOPKINS UNIVERSITY (ii) TITLE OF INVENTION: GROWTH DIFFERENTIATION FACTOR-8 (iii) NUMBER OF SEQUENCES: 17 (iv) CORRESPONDENCE ADDRESS: (A) ADDRESSEE: Spensley Horn Jubas & Lubitz (B) STREET: 1880 Century Park East - Suite 500 (C) CITY: Los Angeles (D) STATE: California (E) COUNTRY: USA (F) ZIP: 90067 (v) COMPUTER READABLE FORM: (A) MEDIUM TYPE: Floppy disk (B) COMPUTER: IBM PC compatible (C) OPERATING SYSTEM: PC-DOS/MS-DOS (D) SOFTWARE: PatentIn Release #1.0, Version #1.25 (vi) CURRENT APPLICATION DATA: (A) APPLICATION NUMBER: PCT (B) FILING DATE: 18-MAR-1994 (C) CLASSIFICATION: (viii) ATTORNEY/AGENT INFORMATION: (A) NAME: Wethere11, Jr., Ph.D., John R. , (B) REGISTRATION NUMBER: 31,678 (C) REFERENCE/DOCKET NUMBER: FD-3413 CIP PCT (ix) TELECOMMUNICATION INFORMATION: (A) TELEPHONE: (619) 455-5100 (B) TELEFAX: (619) 455-5110 (2) INFORMATION FOR SEQ ID NO:l: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 35 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (vii) IMMEDIATE SOURCE: (B) CLONE: SJL141 (ix) FEATURE: (A) NAME/KEY: modified_base (B) LOCATION: 1..35 (D) OTHER INFORMATION: /mod_base= i /note= ""B" is defined as "I" (inosine)' (xi) SEQUENCE DESCRIPTION: SEQ ID N0:1: CCGGAATTCG GBTGGVANRA YTGGRTBRTB KCBCC 35 (2) INFORMATION FOR SEQ ID NO:2: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 33 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (vii) IMMEDIATE SOURCE: (B) CLONE: SJL147 (ix) FEATURE: (A) NAME/KEY: CDS (B) LOCATION: 1..33 (ix) FEATURE: (A) NAME/KEY: modified_base (B) LOCATION: 1..33 (D) OTHER INFORMATION: /mod_base= i /note= ""B" is defined as "I" (inosine)" (xi) SEQUENCE DESCRIPTION: SEQ ID NO:2: CCGGAATTCR CABSCRCARC TNTCBACBRY CAT 33 (2) INFORMATION FOR SEQ ID NO:3: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 32 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (vii) IMMEDIATE SOURCE: (B) CLONE: ACM13 (ix) FEATURE: (A) NAME/KEY: CDS (B) LOCATION: 1..32 (xi) SEQUENCE DESCRIPTION: SEQ ID NO:3: CGCGGATCCA GAAGTCAAGG TGACAGACAC AC 32 (2) INFORMATION FOR SEQ ID NO: : (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 33 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (vii) IMMEDIATE SOURCE: (B) CLONE: ACM14 (ix) FEATURE: (A) NAME/KEY: CDS (B) LOCATION: 1..33 (xi) SEQUENCE DESCRIPTION: SEQ ID N0:4: CGCGGATCCT CCTCATGAGC ACCCACAGCG GTC 33 (2) INFORMATION FOR SEQ ID NO:5: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 550 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (vii) IMMEDIATE SOURCE: (B) CLONE: mouse GDF-8 (ix) FEATURE: (A) NAME/KEY: CDS (B) LOCATION: 59..436 (xi) SEQUENCE DESCRIPTION: SEQ ID NO:5: TTAAGGTAGG AAGGATTTCA GGCTCTATTT ACATAATTGT TCTTTCCTTT TCACACAG 58 AAT CCC TTT TTA GAA GTC AAG GTG ACA GAC ACA CCC AAG AGG TCC CGG 106 Asn Pro Phe Leu Glu Val Lys Val Thr Asp Thr Pro Lys Arg Ser Arg 1 5 10 15 AGA GAC TTT GGG CTT GAC TGC GAT GAG CAC TCC ACG GAA TCC CGG TGC 154 Arg Asp Phe Gly Leu Asp Cys Asp Glu His Ser Thr Glu Ser Arg Cys 20 25 30 TGC CGC TAC CCC CTC ACG GTC GAT TTT GAA GCC TTT GGA TGG GAC TGG 202 Cys Arg Tyr Pro Leu Thr Val Asp Phe Glu Ala Phe Gly Trp Asp Trp 35 40 45 ATT ATC GCA CCC AAA AGA TAT AAG GCC AAT TAC TGC TCA GGA GAG TGT 250 He He Ala Pro Lys Arg Tyr Lys Ala Asn Tyr Cys Ser Gly Glu Cys 50 55 60 GAA TTT GTG TTT TTA CAA AAA TAT CCG CAT ACT CAT CTT GTG CAC CAA 298 Glu Phe Val Phe Leu Gin Lys Tyr Pro His Thr His Leu Val His Gin 65 70 75 80 GCA AAC CCC AGA GGC TCA GCA GGC CCT TGC TGC ACT CCG ACA AAA ATG 346 Ala Asn Pro Arg Gly Ser Ala Gly Pro Cys Cys Thr Pro Thr Lys Met 85 90 95 TCT CCC ATT AAT ATG CTA TAT TTT AAT GGC AAA GAA CAA ATA ATA TAT 394 Ser Pro He Asn Met Leu Tyr Phe Asn Gly Lys Glu Gin He He Tyr 100 105 110 GGG AAA ATT CCA GCC ATG GTA GTA GAC CGC TGT GGG TGC TCA 436 Gly Lys He Pro Ala Met Val Val Asp Arg Cys Gly Cys Ser 115 120 125 TGAGCTTTGC ATTAGGTTAG AAACTTCCCA AGTCATGGAA GGTCTTCCCC TCAATTTCGA 496 AACTGTGAAT TCCTGCAGCC CGGGGGATCC ACTAGTTCTA GAGCGGCCGC CACC 550 (2) INFORMATION FOR SEQ ID NO:6: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 126 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:6: Asn Pro Phe Leu Glu Val Lys Val Thr Asp Thr Pro Lys Arg Ser Arg 1 5 10 15 Arg Asp Phe Gly Leu Asp Cys Asp Glu His Ser Thr Glu Ser Arg Cys 20 25 30 Cys Arg Tyr Pro Leu Thr Val Asp Phe Glu Ala Phe Gly Trp Asp Trp 35 40 45 He He Ala Pro Lys Arg Tyr Lys Ala Asn Tyr Cys Ser Gly Glu Cys 50 55 60 Glu Phe Val Phe Leu Gin Lys Tyr Pro His Thr His Leu Val His Gin 65 70 75 80 Ala Asn Pro Arg Gly Ser Ala Gly Pro Cys Cys Thr Pro Thr Lys Met 85 90 95 Ser Pro He Asn Met Leu Tyr Phe Asn Gly Lys Glu Gin He He Tyr 100 105 110 Gly Lys He Pro Ala Met Val Val Asp Arg Cys Gly Cys Ser 115 120 125 (2) INFORMATION FOR SEQ ID NO:7: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 326 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (vii) IMMEDIATE SOURCE: (B) CLONE: human GDF-8 (ix) FEATURE: (A) NAME/KEY: CDS (B) LOCATION: 3..326 (xi) SEQUENCE DESCRIPTION: SEQ ID NO:7: CA AAA AGA TCC AGA AGG GAT TTT GGT CTT GAC TGT GAT GAG CAC TCA 47 Lys Arg Ser Arg Arg Asp Phe Gly Leu Asp Cys Asp Glu His Ser 1 5 10 15 ACA GAA TCA CGA TGC TGT CGT TAC CCT CTA ACT GTG GAT TTT GAA GCT 95 Thr Glu Ser Arg Cys Cys Arg Tyr Pro Leu Thr Val Asp Phe Glu Ala 20 25 30 TTT GGA TGG GAT TGG ATT ATC GCT CCT AAA AGA TAT AAG GCC AAT TAC 143 Phe Gly Trp Asp Trp He He Ala Pro Lys Arg Tyr Lys Ala Asn Tyr 35 40 45 TGC TCT GGA GAG TGT GAA TTT GTA TTT TTA CAA AAA TAT CCT CAT ACT 191 Cys Ser Gly Glu Cys Glu Phe Val Phe Leu Gin Lys Tyr Pro His Thr 50 55 60 CAT CTG GTA CAC CAA GCA AAC CCC AGA GGT TCA GCA GGC CCT TGC TGT 239 His Leu Val His Gin Ala Asn Pro Arg Gly Ser Ala Gly Pro Cys Cys 65 70 75 ACT CCC ACA AAG ATG TCT CCA ATT AAT ATG CTA TAT TTT AAT GGC AAA 287 Thr Pro Thr Lys Met Ser Pro He Asn Met Leu Tyr Phe Asn Gly Lys 80 85 90 95 GAA CAA ATA ATA TAT GGG AAA ATT CCA GCG ATG GTA GTA 326 Glu Gin He He Tyr Gly Lys He Pro Ala Met Val Val 100 105 (2) INFORMATION FOR SEQ ID NO:8: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 108 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:8: Lys Arg Ser Arg Arg Asp Phe Gly Leu Asp Cys Asp Glu His Ser Thr 1 5 10 15 Glu Ser Arg Cys Cys Arg Tyr Pro Leu Thr Val Asp Phe Glu Ala Phe 20 25 30 Gly Trp Asp Trp He He Ala Pro Lys Arg Tyr Lys Ala Asn Tyr Cys 35 40 45 Ser Gly Glu Cys Glu Phe Val Phe Leu Gin Lys Tyr Pro His Thr His 50 55 60 Leu Val His Gin Ala Asn Pro Arg Gly Ser Ala Gly Pro Cys Cys Thr 65 70 75 80 Pro Thr Lys Met Ser Pro He Asn Met Leu Tyr Phe Asn Gly Lys Glu 85 90 95 Gin He He Tyr Gly Lys He Pro Ala Met Val Val 100 105 (2) INFORMATION FOR SEQ ID NO: 9: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 9 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: peptide (vii) IMMEDIATE SOURCE: (B) CLONE: SJL141 (ix) FEATURE: (A) NAME/KEY: Peptide (B) LOCATION: 1..9 (D) OTHER INFORMATION: /note= "His = His, Asn, Lys, Asp or Glu; Asp = Asp or Asn; Val = Val, He or Met; Ala - Ala or Ser." (xi) SEQUENCE DESCRIPTION: SEQ ID NO:9: Gly Trp His Asp Trp Val Val Ala Pro 1 5 (2) INFORMATION FOR SEQ ID NO:10: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 8 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: peptide (vii) IMMEDIATE SOURCE: (B) CLONE: SJL147 (ix) FEATURE: (A) NAME/KEY: Peptide (B) LOCATION: 1..8 (D) OTHER INFORMATION: /note= "He - He, Val, Met, Thr or Ala; Asp = Asp or Glu; Gly = Gly or Ala." (xi) SEQUENCE DESCRIPTION: SEQ ID NO:10: Met He Val Asp Ser Cys Gly Cys 1 5 (2) INFORMATION FOR SEQ ID NO:11: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 2676 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (vii) IMMEDIATE SOURCE: (B) CLONE: Murine GDF-8 ( ix) FEATURE : (A) NAME/KEY: CDS (B) LOCATION: 104..1231 (xi) SEQUENCE DESCRIPTION: SEQ ID NO:11: GTCTCTCGGA CGGTACATGC ACTAATATTT CACTTGGCAT TACTCAAAAG CAAAAAGAAG 60 AAATAAGAAC AAGGGAAAAA AAAAGATTGT GCTGATTTTT AAA ATG ATG CAA AAA 115 Met Met Gin Lys 1 CTG CAA ATG TAT GTT TAT ATT TAC CTG TTC ATG CTG ATT GCT GCT GGC 163 Leu Gin Met Tyr Val Tyr He Tyr Leu Phe Met Leu He Ala Ala Gly 5 10 15 20 CCA GTG GAT CTA AAT GAG GGC AGT GAG AGA GAA GAA AAT GTG GAA AAA 211 Pro Val Asp Leu Asn Glu Gly Ser Glu Arg Glu Glu Asn Val Glu Lys 25 30 35 GAG GGG CTG TGT AAT GCA TGT GCG TGG AGA CAA AAC ACG AGG TAC TCC 259 Glu Gly Leu Cys Asn Ala Cys Ala Trp Arg Gin Asn Thr Arg Tyr Ser 40 45 50 AGA ATA GAA GCC ATA AAA ATT CAA ATC CTC AGT AAG CTG CGC CTG GAA 307 Arg He Glu Ala He Lys He Gin He Leu Ser Lys Leu Arg Leu Glu 55 60 65 ACA GCT CCT AAC ATC AGC AAA GAT GCT ATA AGA CAA CTT CTG CCA AGA 355 Thr Ala Pro Asn He Ser Lys Asp Ala He Arg Gin Leu Leu Pro Arg 70 75 80 GCG CCT CCA CTC CGG GAA CTG ATC GAT CAG TAC GAC GTC CAG AGG GAT 403 Ala Pro Pro Leu Arg Glu Leu He Asp Gin Tyr Asp Val Gin Arg Asp 85 90 95 100 GAC AGC AGT GAT GGC TCT TTG GAA GAT GAC GAT TAT CAC GCT ACC ACG 451 Asp Ser Ser Asp Gly Ser Leu Glu Asp Asp Asp Tyr His Ala Thr Thr 105 110 115 GAA ACA ATC ATT ACC ATG CCT ACA GAG TCT GAC TTT CTA ATG CAA GCG 499 Glu Thr He He Thr Met Pro Thr Glu Ser Asp Phe Leu Met Gin Ala 120 125 130 GAT GGC AAG CCC AAA TGT TGC TTT TTT AAA TTT AGC TCT AAA ATA CAG 547 Asp Gly Lys Pro Lys Cys Cys Phe Phe Lys Phe Ser Ser Lys He Gin 135 140 145 TAC AAC AAA GTA GTA AAA GCC CAA CTG TGG ATA TAT CTC AGA CCC GTC 595 Tyr Asn Lys Val Val Lys Ala Gin Leu Trp He Tyr Leu Arg Pro Val 150 155 160 AAG ACT CCT ACA ACA GTG TTT GTG CAA ATC CTG AGA CTC ATC AAA CCC 643 Lys Thr Pro Thr Thr Val Phe Val Gin He Leu Arg Leu He Lys Pro 165 170 175 180 ATG AAA GAC GGT ACA AGG TAT ACT GGA ATC CGA TCT CTG AAA CTT GAC 691 Met Lys Asp Gly Thr Arg Tyr Thr Gly He Arg Ser Leu Lys Leu Asp 185 190 195 ATG AGC CCA GGC ACT GGT ATT TGG CAG AGT ATT GAT GTG AAG ACA GTG 739 Met Ser Pro Gly Thr Gly He Trp Gin Ser He Asp Val Lys Thr Val 200 205 210 TTG CAA AAT TGG CTC AAA CAG CCT GAA TCC AAC TTA GGC ATT GAA ATC 787 Leu Gin Asn Trp Leu Lys Gin Pro Glu Ser Asn Leu Gly He Glu He 215 220 225 AAA GCT TTG GAT GAG AAT GGC CAT GAT CTT GCT GTA ACC TTC CCA GGA 835 Lys Ala Leu Asp Glu Asn Gly His Asp Leu Ala Val Thr Phe Pro Gly 230 235 240 CCA GGA GAA GAT GGG CTG AAT CCC TTT TTA GAA GTC AAG GTG ACA GAC 883 Pro Gly Glu Asp Gly Leu Asn Pro Phe Leu Glu Val Lys Val Thr Asp 245 250 255 260 ACA CCC AAG AGG TCC CGG AGA GAC TTT GGG CTT GAC TGC GAT GAG CAC 931 Thr Pro Lys Arg Ser Arg Arg Asp Phe Gly Leu Asp Cys Asp Glu His 265 270 275 TCC ACG GAA TCC CGG TGC TGC CGC TAC CCC CTC ACG GTC GAT TTT GAA 979 Ser Thr Glu Ser Arg Cys Cys Arg Tyr Pro Leu Thr Val Asp Phe Glu 280 285 290 GCC TTT GGA TGG GAC TGG ATT ATC GCA CCC AAA AGA TAT AAG GCC AAT 1027 Ala Phe Gly Trp Asp Trp He He Ala Pro Lys Arg Tyr Lys Ala Asn 295 300 305 TAC TGC TCA GGA GAG TGT GAA TTT GTG TTT TTA CAA AAA TAT CCG CAT 1075 Tyr Cys Ser Gly Glu Cys Glu Phe Val Phe Leu Gin Lys Tyr Pro His 310 315 320 ACT CAT CTT GTG CAC CAA GCA AAC CCC AGA GGC TCA GCA GGC CCT TGC 1123 Thr His Leu Val His Gin Ala Asn Pro Arg Gly Ser Ala Gly Pro Cys 325 330 335 340 TGC ACT CCG ACA AAA ATG TCT CCC ATT AAT ATG CTA TAT TTT AAT GGC 1171 Cys Thr Pro Thr Lys Met Ser Pro He Asn Met Leu Tyr Phe Asn Gly 345 350 355 AAA GAA CAA ATA ATA TAT GGG AAA ATT CCA GCC ATG GTA GTA GAC CGC 1219 Lys Glu Gin He He Tyr Gly Lys He Pro Ala Met Val Val Asp Arg 360 365 370 TGT GGG TGC TCA TGAGCTTTGC ATTAGGTTAG AAACTTCCCA AGTCATGGAA 1271 Cys Gly Cys Ser 375 GGTCTTCCCC TCAATTTCGA AACTGTGAAT TCAAGCACCA CAGGCTGTAG GCCTTGAGTA 1331 TGCTCTAGTA ACGTAAGCAC AAGCTACAGT GTATGAACTA AAAGAGAGAA TAGATGCAAT 1391 GGTTGGCATT CAACCACCAA AATAAACCAT ACTATAGGAT GTTGTATGAT TTCCAGAGTT 1451 TTTGAAATAG ATGGAGATCA AATTACATTT ATGTCCATAT ATGTATATTA CAACTACAAT 1511 CTAGGCAAGG AAGTGAGAGC ACATCTTGTG GTCTGCTGAG TTAGGAGGGT ATGATTAAAA 1571 GGTAAAGTCT TATTTCCTAA CAGTTTCACT TAATATTTAC AGAAGAATCT ATATGTAGCC 1631 TTTGTAAAGT GTAGGATTGT TATCATTTAA AAACATCATG TACACTTATA TTTGTATTGT 1691 ATACTTGGTA AGATAAAATT CCACAAAGTA GGAATGGGGC CTCACATACA CATTGCCATT 1751 CCTATTATAA TTGGACAATC CACCACGGTG CTAATGCAGT GCTGAATGGC TCCTACTGGA 1811 CCTCTCGATA GAACACTCTA CAAAGTACGA GTCTCTCTCT CCCTTCCAGG TGCATCTCCA 1871 CACACACAGC ACTAAGTGTT CAATGCATTT TCTTTAAGGA AAGAAGAATC TTTTTTTCTA 1931 GAGGTCAACT TTCAGTCAAC TCTAGCACAG CGGGAGTGAC TGCTGCATCT TAAAAGGCAG 1991 CCAAACAGTA TTCATTTTTT AATCTAAATT TCAAAATCAC TGTCTGCCTT TATCACATGG 2051 CAATTTTGTG GTAAAATAAT GGAAATGACT GGTTCTATCA ATATTGTATA AAAGACTCTG 2111 AAACAATTAC ATTTATATAA TATGTATACA ATATTGTTTT GTAAATAAGT GTCTCCTTTT 2171 ATATTTACTT TGGTATATTT TTACACTAAT GAAATTTCAA ATCATTAAAG TACAAAGACA 2231 TGTCATGTAT CACAAAAAAG GTGACTGCTT CTATTTCAGA GTGAATTAGC AGATTCAATA 2291 GTGGTCTTAA AACTCTGTAT GTTAAGATTA GAAGGTTATA TTACAATCAA TTTATGTATT 2351 TTTTACATTA TCAACTTATG GTTTCATGGT GGCTGTATCT ATGAATGTGG CTCCCAGTCA 2411 AATTTCAATG CCCCACCATT TTAAAAATTA CAAGCATTAC TAAACATACC AACATGTATC 2471 TAAAGAAATA CAAATATGGT ATCTCAATAA CAGCTACTTT TTTATTTTAT AATTTGACAA 2531 TGAATACATT TCTTTTATTT ACTTCAGTTT TATAAATTGG AACTTTGTTT ATCAAATGTA 2591 TTGTACTCAT AGCTAAATGA AATTATTTCT TACATAAAAA TGTGTAGAAA CTATAAATTA 2651 AAGTGTTTTC ACATTTTTGA AAGGC 2676 (2) INFORMATION FOR SEQ ID NO:12: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 376 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:12: Met Met Gin Lys Leu Gin Met Tyr Val Tyr He Tyr Leu Phe Met Leu 1 5 10 15 He Ala Ala Gly Pro Val Asp Leu Asn Glu Gly Ser Glu Arg Glu Glu 20 25 30 Asn Val Glu Lys Glu Gly Leu Cys Asn Ala Cys Ala Trp Arg Gin Asn 35 40 45 Thr Arg Tyr Ser Arg He Glu Ala He Lys He Gin He Leu Ser Lys 50 55 60 Leu Arg Leu Glu Thr Ala Pro Asn He Ser Lys Asp Ala He Arg Gin 65 70 75 80 Leu Leu Pro Arg Ala Pro Pro Leu Arg Glu Leu He Asp Gin Tyr Asp 85 90 95 Val Gin Arg Asp Asp Ser Ser Asp Gly Ser Leu Glu Asp Asp Asp Tyr 100 105 110 His Ala Thr Thr Glu Thr He He Thr Met Pro Thr Glu Ser Asp Phe 115 120 125 Leu Met Gin Ala Asp Gly Lys Pro Lys Cys Cys Phe Phe Lys Phe Ser 130 135 140 Ser Lys He Gin Tyr Asn Lys Val Val Lys Ala Gin Leu Trp He Tyr 145 150 155 160 Leu Arg Pro Val Lys Thr Pro Thr Thr Val Phe Val Gin He Leu Arg 165 170 175 Leu He Lys Pro Met Lys Asp Gly Thr Arg Tyr Thr Gly He Arg Ser 180 185 190 Leu Lys Leu Asp Met Ser Pro Gly Thr Gly He Trp Gin Ser He Asp 195 200 205 Val Lys Thr Val Leu Gin Asn Trp Leu Lys Gin Pro Glu Ser Asn Leu 210 215 220 Gly He Glu He Lys Ala Leu Asp Glu Asn Gly His Asp Leu Ala Val 225 230 235 240 Thr Phe Pro Gly Pro Gly Glu Asp Gly Leu Asn Pro Phe Leu Glu Val 245 250 255 Lys Val Thr Asp Thr Pro Lys Arg Ser Arg Arg Asp Phe Gly Leu Asp 260 265 270 Cys Asp Glu His Ser Thr Glu Ser Arg Cys Cys Arg Tyr Pro Leu Thr 275 280 285 Val Asp Phe Glu Ala Phe Gly Trp Asp Trp He He Ala Pro Lys Arg 290 295 300 Tyr Lys Ala Asn Tyr Cys Ser Gly Glu Cys Glu Phe Val Phe Leu Gin 305 310 315 320 Lys Tyr Pro His Thr His Leu Val His Gin Ala Asn Pro Arg Gly Ser 325 330 335 Ala Gly Pro Cys Cys Thr Pro Thr Lys Met Ser Pro He Asn Met Leu 340 345 350 Tyr Phe Asn Gly Lys Glu Gin He He Tyr Gly Lys He Pro Ala Met 355 360 365 Val Val Asp Arg Cys Gly Cys Ser 370 375 (2) INFORMATION FOR SEQ ID NO:13: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 2743 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (vii) IMMEDIATE SOURCE: (B) CLONE: Human GDF-8 (ix) FEATURE: (A) NAME/KEY: CDS (B) LOCATION: 59..1183 (xi) SEQUENCE DESCRIPTION: SEQ ID NO:13: AAGAAAAGTA AAAGGAAGAA ACAAGAACAA GAAAAAAGAT TATATTGATT TTAAAATC 58 ATG CAA AAA CTG CAA CTC TGT GTT TAT ATT TAC CTG TTT ATG CTG ATT 106 Met Gin Lys Leu Gin Leu Cys Val Tyr He Tyr Leu Phe Met Leu He 1 5 10 15 GTT GCT GGT CCA GTG GAT CTA AAT GAG AAC AGT GAG CAA AAA GAA AAT 154 Val Ala Gly Pro Val Asp Leu Asn Glu Asn Ser Glu Gin Lys Glu Asn 20 25 30 GTG GAA AAA GAG GGG CTG TGT AAT GCA TGT ACT TGG AGA CAA AAC ACT 202 Val Glu Lys Glu Gly Leu Cys Asn Ala Cys Thr Trp Arg Gin Asn Thr 35 40 45 AAA TCT TCA AGA ATA GAA GCC ATT AAG ATA CAA ATC CTC AGT AAA CTT 250 Lys Ser Ser Arg He Glu Ala He Lys He Gin He Leu Ser Lys Leu 50 55 60 CGT CTG GAA ACA GCT CCT AAC ATC AGC AAA GAT GTT ATA AGA CAA CTT 298 Arg Leu Glu Thr Ala Pro Asn He Ser Lys Asp Val He Arg Gin Leu 65 70 75 80 TTA CCC AAA GCT CCT CCA CTC CGG GAA CTG ATT GAT CAG TAT GAT GTC 346 Leu Pro Lys Ala Pro Pro Leu Arg Glu Leu He Asp Gin Tyr Asp Val 85 90 95 CAG AGG GAT GAC AGC AGC GAT GGC TCT TTG GAA GAT GAC GAT TAT CAC 394 Gin Arg Asp Asp Ser Ser Asp Gly Ser Leu Glu Asp Asp Asp Tyr His 100 105 110 GCT ACA ACG GAA ACA ATC ATT ACC ATG CCT ACA GAG TCT GAT TTT CTA 442 Ala Thr Thr Glu Thr He He Thr Met Pro Thr Glu Ser Asp Phe Leu 115 120 125 ATG CAA GTG GAT GGA AAA CCC AAA TGT TGC TTC TTT AAA TTT AGC TCT 490 Met Gin Val Asp Gly Lys Pro Lys Cys Cys Phe Phe Lys Phe Ser Ser 130 135 140 AAA ATA CAA TAC AAT AAA GTA GTA AAG GCC CAA CTA TGG ATA TAT TTG 538 Lys He Gin Tyr Asn Lys Val Val Lys Ala Gin Leu Trp He Tyr Leu 145 150 155 160 AGA CCC GTC GAG ACT CCT ACA ACA GTG TTT GTG CAA ATC CTG AGA CTC 586 Arg Pro Val Glu Thr Pro Thr Thr Val Phe Val Gin He Leu Arg Leu 165 170 175 ATC AAA CCT ATG AAA GAC GGT ACA AGG TAT ACT GGA ATC CGA TCT CTG 634 He Lys Pro Met Lys Asp Gly Thr Arg Tyr Thr Gly He Arg Ser Leu 180 185 190 AAA CTT GAC ATG AAC CCA GGC ACT GGT ATT TGG CAG AGC ATT GAT GTG 682 Lys Leu Asp Met Asn Pro Gly Thr Gly He Trp Gin Ser He Asp Val 195 200 205 AAG ACA GTG TTG CAA AAT TGG CTC AAA CAA CCT GAA TCC AAC TTA GGC 730 Lys Thr Val Leu Gin Asn Trp Leu Lys Gin Pro Glu Ser Asn Leu Gly 210 215 220 ATT GAA ATA AAA GCT TTA GAT GAG AAT GGT CAT GAT CTT GCT GTA ACC 778 He Glu He Lys Ala Leu Asp Glu Asn Gly His Asp Leu Ala Val Thr 225 230 235 240 TTC CCA GGA CCA GGA GAA GAT GGG CTG AAT CCG TTT TTA GAG GTC AAG 826 Phe Pro Gly Pro Gly Glu Asp Gly Leu Asn Pro Phe Leu Glu Val Lys 245 250 255 GTA ACA GAC ACA CCA AAA AGA TCC AGA AGG GAT TTT GGT CTT GAC TGT 874 Val Thr Asp Thr Pro Lys Arg Ser Arg Arg Asp Phe Gly Leu Asp Cys 260 265 270 GAT GAG CAC TCA ACA GAA TCA CGA TGC TGT CGT TAC CCT CTA ACT GTG 922 Asp Glu His Ser Thr Glu Ser Arg Cys Cys Arg Tyr Pro Leu Thr Val 275 280 285 GAT TTT GAA GCT TTT GGA TGG GAT TGG ATT ATC GCT CCT AAA AGA TAT 970 Asp Phe Glu Ala Phe Gly Trp Asp Trp He He Ala Pro Lys Arg Tyr 290 295 300 AAG GCC AAT TAC TGC TCT GGA GAG TGT GAA TTT GTA TTT TTA CAA AAA 1018 Lys Ala Asn Tyr Cys Ser Gly Glu Cys Glu Phe Val Phe Leu Gin Lys 305 310 315 320 TAT CCT CAT ACT CAT CTG GTA CAC CAA GCA AAC CCC AGA GGT TCA GCA 1066 Tyr Pro His Thr His Leu Val His Gin Ala Asn Pro Arg Gly Ser Ala 325 330 335 GGC CCT TGC TGT ACT CCC ACA AAG ATG TCT CCA ATT AAT ATG CTA TAT 1114 Gly Pro Cys Cys Thr Pro Thr Lys Met Ser Pro He Asn Met Leu Tyr 340 345 350 TTT AAT GGC AAA GAA CAA ATA ATA TAT GGG AAA ATT CCA GCG ATG GTA 1162 Phe Asn Gly Lys Glu Gin He He Tyr Gly Lys He Pro Ala Met Val 355 360 365 GTA GAC CGC TGT GGG TGC TCA TGAGATTTAT ATTAAGCGTT CATAACTTCC 1213 Val Asp Arg Cys Gly Cys Ser 370 375 TAAAACATGG AAGGTTTTCC CCTCAACAAT TTTGAAGCTG TGAAATTAAG TACCACAGGC 1273 TATAGGCCTA GAGTATGCTA CAGTCACTTA AGCATAAGCT ACAGTATGTA AACTAAAAGG 1333 GGGAATATAT GCAATGGTTG GCATTTAACC ATCCAAACAA ATCATACAAG AAAGTTTTAT 1393 GATTTCCAGA GTTTTTGAGC TAGAAGGAGA TCAAATTACA TTTATGTTCC TATATATTAC 1453 AACATCGGCG AGGAAATGAA AGCGATTCTC CTTGAGTTCT GATGAATTAA AGGAGTATGC 1513 TTTAAAGTCT ATTTCTTTAA AGTTTTGTTT AATATTTACA GAAAAATCCA CATACAGTAT 1573 TGGTAAAATG CAGGATTGTT ATATACCATC ATTCGAATCA TCCTTAAACA CTTGAATTTA 1633 TATTGTATGG TAGTATACTT GGTAAGATAA AATTCCACAA AAATAGGGAT GGTGCAGCAT 1693 ATGCAATTTC CATTCCTATT ATAATTGACA CAGTACATTA ACAATCCATG CCAACGGTGC 1753 TAATACGATA GGCTGAATGT CTGAGGCTAC CAGGTTTATC ACATAAAAAA CATTCAGTAA 1813 AATAGTAAGT TTCTCTTTTC TTCAGGTGCA TTTTCCTACA CCTCCAAATG AGGAATGGAT 1873 TTTCTTTAAT GTAAGAAGAA TCATTTTTCT AGAGGTTGGC TTTCAATTCT GTAGCATACT 1933 TGGAGAAACT GCATTATCTT AAAAGGCAGT CAAATGGTGT TTGTTTTTAT CAAAATGTCA 1993 AAATAACATA CTTGGAGAAG TATGTAATTT TGTCTTTGGA AAATTACAAC ACTGCCTTTG 2053 CAACACTGCA GTTTTTATGG TAAAATAATA GAAATGATCG ACTCTATCAA TATTGTATAA 2113 AAAGACTGAA ACAATGCATT TATATAATAT GTATACAATA TTGTTTTGTA AATAAGTGTC 2173 TCCTTTTTTA TTTACTTTGG TATATTTTTA CACTAAGGAC ATTTCAAATT AAGTACTAAG 2233 GCACAAAGAC ATGTCATGCA TCACAGAAAA GCAACTACTT ATATTTCAGA GCAAATTAGC 2293 AGATTAAATA GTGGTCTTAA AACTCCATAT GTTAATGATT AGATGGTTAT ATTACAATCA 2353 TTTTATATTT TTTTACATGA TTAACATTCA CTTATGGATT CATGATGGCT GTATAAAGTG 2413 AATTTGAAAT TTCAATGGTT TACTGTCATT GTGTTTAAAT CTCAACGTTC CATTATTTTA 2473 ATACTTGCAA AAACATTACT AAGTATACCA AAATAATTGA CTCTATTATC TGAAATGAAG 2533 AATAAACTGA TGCTATCTCA ACAATAACTG TTACTTTTAT TTTATAATTT GATAATGAAT 2593 ATATTTCTGC ATTTATTTAC TTCTGTTTTG TAAATTGGGA TTTTGTTAAT CAAATTTATT 2653 GTACTATGAC TAAATGAAAT TATTTCTTAC ATCTAATTTG TAGAAACAGT ATAAGTTATA 2713 TTAAAGTGTT TTCACATTTT TTTGAAAGAC 2743 (2) INFORMATION FOR SEQ ID NO:14: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 375 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:14: Met Gin Lys Leu Gin Leu Cys Val Tyr He Tyr Leu Phe Met Leu He 1 5 10 15 Val Ala Gly Pro Val Asp Leu Asn Glu Asn Ser Glu Gin Lys Glu Asn 20 25 30 Val Glu Lys Glu Gly Leu Cys Asn Ala Cys Thr Trp Arg Gin Asn Thr 35 40 45 Lys Ser Ser Arg He Glu Ala He Lys He Gin He Leu Ser Lys Leu 50 55 60 Arg Leu Glu Thr Ala Pro Asn He Ser Lys Asp Val He Arg Gin Leu 65 70 75 80 Leu Pro Lys Ala Pro Pro Leu Arg Glu Leu He Asp Gin Tyr Asp Val 85 90 95 Gin Arg Asp Asp Ser Ser Asp Gly Ser Leu Glu Asp Asp Asp Tyr His 100 105 110 Ala Thr Thr Glu Thr He He Thr Met Pro Thr Glu Ser Asp Phe Leu 115 120 125 Met Gin Val Asp Gly Lys Pro Lys Cys Cys Phe Phe Lys Phe Ser Ser 130 135 140 Lys He Gin Tyr Asn Lys Val Val Lys Ala Gin Leu Trp He Tyr Leu 145 150 155 160 Arg Pro Val Glu Thr Pro Thr Thr Val Phe Val Gin He Leu Arg Leu 165 170 175 He Lys Pro Met Lys Asp Gly Thr Arg Tyr Thr Gly He Arg Ser Leu 180 185 190 Lys Leu Asp Met Asn Pro Gly Thr Gly He Trp Gin Ser He Asp Val 195 200 205 Lys Thr Val Leu Gin Asn Trp Leu Lys Gin Pro Glu Ser Asn Leu Gly 210 215 220 He Glu He Lys Ala Leu Asp Glu Asn Gly His Asp Leu Ala Val Thr 225 230 235 240 Phe Pro Gly Pro Gly Glu Asp Gly Leu Asn Pro Phe Leu Glu Val Lys 245 250 255 Val Thr Asp Thr Pro Lys Arg Ser Arg Arg Asp Phe Gly Leu Asp Cys 260 265 270 Asp Glu His Ser Thr Glu Ser Arg Cys Cys Arg Tyr Pro Leu Thr Val 275 280 285 Asp Phe Glu Ala Phe Gly Trp Asp Trp He He Ala Pro Lys Arg Tyr 290 295 300 Lys Ala Asn Tyr Cys Ser Gly Glu Cys Glu Phe Val Phe Leu Gin Lys 305 310 315 320 Tyr Pro His Thr His Leu Val His Gin Ala Asn Pro Arg Gly Ser Ala 325 330 335 Gly Pro Cys Cys Thr Pro Thr Lys Met Ser Pro He Asn Met Leu Tyr 340 345 350 Phe Asn Gly Lys Glu Gin He He Tyr Gly Lys He Pro Ala Met Val 355 360 365 Val Asp Arg Cys Gly Cys Ser 370 375 (2) INFORMATION FOR SEQ ID NO:15: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 34 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (vii) IMMEDIATE SOURCE: (B) CLONE: #83 (ix) FEATURE: (A) NAME/KEY: CDS (B) LOCATION: 1..34 (xi) SEQUENCE DESCRIPTION: SEQ ID NO:15: CGCGGATCCG TGGATCTAAA TGAGAACAGT GAGC 34 (2) INFORMATION FOR SEQ ID NO:16: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 37 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (vii) IMMEDIATE SOURCE: (B) CLONE: #84 (ix) FEATURE: (A) NAME/KEY: CDS (B) LOCATION: 1..37 (xi) SEQUENCE DESCRIPTION: SEQ ID NO:16: CGCGAATTCT CAGGTAATGA TTGTTTCCGT TGTAGCG 37 (2) INFORMATION FOR SEQ ID NO:17: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 20 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (vii) IMMEDIATE SOURCE: (B) CLONE: #100 (xi) SEQUENCE DESCRIPTION: SEQ ID NO:17: ACACTAAATC TTCAAGAATA 20

Claims: C LAI MS 1. Substantially pure growth differentiation factor-8 (GDF-8) and functional fragments thereof. 2. An isolated polynucleotide sequence encoding the GDF-8 polypeptide of claim 1. 3. The polynucleotide of claim 2, wherein the GDF-8 nucleotide sequence is selected from the group consisting of the nucleic acid sequence of a. FIGURE 5a, wherein T can also be U; b. FIGURE 5b, wherein T can also be U; c. nucleic acid sequences complementary to FIGURE 5a; d. nucleic acid sequences complementary to FIGURE 5b; e. fragments of a. or c. that are at least 15 bases in length and that will selectively hybridize to genomic DNA which encodes the GDF-8 protein of FIGURE 5a; and f. fragments of b. or d. that are at least 15 bases in length and that will selectively hybridize to genomic DNA which encodes the GDF-8 protein of FIGURE 5b. 4. The polynucleotide sequence of claim 2, wherein the polynucleotide is isolated from a mammalian cell. 5. The polynucleotide of claim 4, wherein the mammalian cell is selected from the group consisting of mouse, rat, and human cell. 6. An expression vector including the polynucleotide of claim 2. 7. The vector of claim 6, wherein the vector is a plasmid. 8. The vector of claim 6, wherein the vector is a virus. 9. A host cell stably transformed with the vector of claim 6. 10. The host cell of claim 9, wherein the cell is prokaryotic. 11. The host cell of claim 9, wherein the cell is eukaryotic. 12. Antibodies reactive with the polypeptide of claim 1 or fragments thereof. 13. The antibodies of claim 12, wherein the antibodies are polyclonal. 14. The antibodies of claim 12, wherein the antibodies are monoclonal. 15. A method of detecting a cell proliferative disorder comprising contacting the antibody of claim 12 with a specimen of a subject suspected of having a GDF-8 associated disorder and detecting binding of the antibody. 16. The method of claim 15, wherein the cell is a muscle cell.. 17. The method of claim 15, wherein the detecting is in vivo. 18. The method of claim 17, wherein the antibody is detectably labeled. 19. The method of claim 18, wherein the detectable label is selected from the group consisting of a radioisotope, a fluorescent compound, a bioluminescent compound and a chemiluminescent compound. 20. The method of claim 15, wherein the detection is in vitro. 21. The method of claim 20, wherein the antibody is detectably labeled. 22. The method of claim 21 , wherein the label is selected from the group consisting of a radioisotope, a fluorescent compound, a bioluminescent compound, a chemoluminescent compound and an enzyme. 23. A method of treating a cell proliferative disorder associated with expression of GDF-8, comprising contacting the cells with a reagent which suppresses the GDF-8 activity. 24. The method of claim 23, wherein the reagent is an anti-GDF-8 antibody. 25. The method of claim 23, wherein the reagent is a GDF-8 antisense sequence. 26. The method of claim 23, wherein the cell is a muscle cell. 27. The method of claim 23, wherein the reagent which suppresses GDF-8 activity is introduced to a cell using a vector. 28. The method of claim 27, wherein the vector is a colloidal dispersion system. 29. The method of claim 28, wherein the colloidal dispersion system is a liposome. 30. The method of claim 29, wherein the liposome is essentially target specific. 31. The method of claim 30, wherein the liposome is anatomically targeted. 32. The method of claim 31 , wherein the liposome is mechanistically targeted. 33. The method of claim 32, wherein the mechanistic targeting is passive. 34. The method of claim 32, wherein the mechanistic targeting is active. 35. The method of claim 34, wherein the liposome is actively targeted by coupling with a moiety selected from the group consisting of a sugar, a glycolipid, and a protein. 36. The method of claim 35, wherein the protein moiety is an antibody. 37. The method of claim 36, wherein the vector is a virus. 38. The method of claim 37, wherein the virus is an RNA virus. 39. The method of claim 38, wherein the RNA virus is a retrovirus. 40. The method of claim 39, wherein the retrovirus is essentially target specific. 41. The method of claim 40, wherein a moiety for target specificity is encoded by a polynucleotide inserted into the retroviral genome. 42. The method of claim 40, wherein a moiety for target specificity is selected from the group consisting of a sugar, a glycolipid, and a protein. 43. The method of claim 42, wherein the protein is an antibody.

Inventors: LEE SE-JIN, MCPHERRON ALEXANDRA C, LEE, SE-JIN, MCPHERRON, ALEXANDRA, C.
Applicants: LEE SE JIN, MCPHERRON ALEXANDRA C, UNIV JOHNS HOPKINS MED, JOHNS HOPKINS UNIVERSITY SCHOOL OF MEDICINE, LEE, SE-JIN, MCPHERRON, ALEXANDRA, C.
Application year: 1994
Main classification: C07K13
IPC codes: C07H21, C07K14, C07K16, C12N1, C12N5, C12N15, C12P21, C12Q1, C12R1, G01N33